Improvement in r esawing-machines



P. PRYIBIL.

RE-SAWING MACHINE.

No.172,772. Patented Jan. 25,1876.

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N.PETERS. PHDTO-LITHOGRAPHER. WASHINGTON D C r. STATES PAUL PRYIBIL, or New' Yonx, N. Y.

IMP'RGVEMENT IN RESAWlNG-MACHINES..

Specification forming part ofjLetters Patent No. 172,772, dated January 25, 1876; application led December 8, 1875.

To au whom it may concern y Be it known that I, PAUL PRYIBIL, of New York, in the county and State` of New York, have invented a certain Improvement in Itesawing-Machines; and I do hereby declare that the followingl is a full, clear, and exact description of the same:

My invention is particularly applicable to machines used for resawing ywhere the thickness of the lumber to be sawed is not uniform throughout; and the object of the invention is to preserve a constant pressure of the feedrollers across the whole face of the work while passing through the machine.

To this end the invention consists in providing one or more of the feed-rollers with swiveled sliding bearings or journal-boxes, and with elastic cushions or springs,'whereby the roller is enabled to Igscillate from a center 1ocated at or near one of its journals7 and beyond its bearing-surface, and automatically adjust itself to the work when the thickness thereof is greater at one edge than at the other, or when roughness or unevenness exists on the surface.

In resawing lumber into boards or planks considerable inconvenience is sometimes experenced in consequence of differences in the thickness of different portions of the timber, and itis dicult to obtain the desired uniformity of thickness in the board or plank unless some means is adopted for preserving uniformity of pressure of the feedrollers against the surface of the work.

In my invention the difculty and inconvenience referred to are overcome by means of devices which are self-adjusting and automatic in their operation.

In carrying out my invention, Iprovide one or more of the feed-rollers with bearings or journal-boxes, which are arranged to slide in ways or guides in a direction transverse to the axis of the roller, and are also pivoted, so as to allow them to oscillate in a direction parallel with the length ofthe roller.

Behind these boxes or bearings are elastic cushions or springs, which are compressed when sufficient pressure is brought to bear upon the feed-roller, but expand to their normal conditionwhen such pressure is removed.

These cushions or springs are provided with set'screws for the purpose of regulating their tension.

The two bearings are similar in their construction and operation and both are attached to a sliding frame provided with a hand-screw for adjusting the rollers to different thicknesses of lumber.

In some cases a weight and a cord and pulley may be substituted for the cushions or springs, where the general construction of the machine will admit, but in most cases the cushions will be found preferable.

When desired, there may be two rollers' on the same side of the machine, provided with the self-adjusting bearings-both rollers being carried by a sliding frame provided with a regulating-screw. l The sliding frame may also be provided with a cushion or spring, to enable it t0 yield when any irregularity or projection on the work comes in contact with the roller.

In the accompanying drawing, Figure l represents a top view, partly in section, of a machine arranged according to my invention. Fig. 2 is a front elevation, with certain portions removed or broken away. Fig. 3 is a vertical section, taken in the line m m of lEig. l.

On the bed A two rollers, B B, are arranged .in stationary bearings; and opposite to them are two rollers, C (l, arranged in adjustable bearings, carried by a frame, G, which is arranged to slide on the bed A.

In some cases there may be only one of the rollers G; but the two are shown in order to illustrate the manner in which they may be arranged, and they are both alike in their construction and operation.

The journals d d of each of the rollers G have their bearings in boxes E E, which are arranged to slide in ways or guides g g in the frame G. Each of the boxes Il is provided with two studs or pivots, e e, which project from two` sides of the box, in opposite directions, transverse to the axis of the roller C, and work in slots ff in the frame G. Thus the boxes are allowed to slide in a direction transverse 'to the axis of the roller, and to oscillate in a direction parallel with the length thereof.

Behind each of the boXes E is a spring or cushion, which is here represented as a block as soon as such pressure is removed the rub-.

ber expands and restores the mal position.

By this construction and arrangement of the roller-bearings a constant pressure of the roller across the whole face of the work a is maintained, as each box moves independently` of the other, so that, if the thickness of the lumber is greater at one edge than at the other, one of the springs or cushions yields, and allows the roller to oscillate from a center located at or near one of its journals and beyond its bearing-surface, andadjust itself to the surface of the work, and maintain a coni stant pressure thereon.

This automatic or self-adjusting action of the roller lis the same in all cases, whether the difference in thickness is in the direction of the width of the lumber or the length thereof.

The cushions H may be provided with setscrews I, passing through the frame and bearboX to its noring against followers c', by means of which the degree of pressure of the rubber against the boxes may be regulated.

In order to enable the sliding frame G to be moved' on the bed'A, to adjust the rollers to the work before commencing to saw, or from time to time as the thickness of the lumber is decreased by successivesawings, an adjusting device is provided, consisting of a hand-screw, J, passing through an arm or standard, K, on the bed A, and provided with a handle or wheel for turning it. -v

' The front end of the screw engages with the frame Gr by means of an internally-threaded portion, Z, so that by turning the screw in one direction or the other the frame and rollers are moved either toward or from the work.

If desired, the sliding frame G may be lprovided with a' spring, cushion, or weight, to enable the rollers to yield with a parallel motion when a slight projection on the work passes the same.

This invention may be applied to machines provided with either circular, reciprocating, or band saws, or gangs of the same, whether used for sawing or resawing; and it will be found of great advantage in all cases where irregularities exist inthe surface of the lumber to be sawed.

- What I claim as new, and desire to secure by Letters Patent, is-

The combination, with the sliding frame G, provided with the ways g g, the sliding and swiveled journal-boxesE E, elastic cushions H, and the feed-rollers C vC, the Whole constructed and arranged toallow each feedroller to oscillate from a center located at or near one of its journals and beyond its bearing-surfaces, substantially as described.

. PAUL PRYIBIL.

Witnesses:

BENJAMIN W. HOFFMAN, FRED. HAYNES.v 'h 

